The Polish Law and Justice party leader, Jaroslaw Kaczynski, will run in the June elections to replace his twin brother, Lech, the president who was killed in a plane crash.

Jaroslaw Kaczynski said he would continue the mission of his brother and others killed in the crash. "The good of Poland is a common duty that requires an ability to overcome personal suffering, to undertake the task despite a personal tragedy."

The elections were moved up to 20 June after the president, his wife Maria and 94 others were killed in Smolensk, Russia on 10 April.

The president's term had been due to expire in December and elections had been planned for the autumn. Lech Kaczynski had been expected to seek a second five-year term.